They’re asking election administrators to use their data to purge voter registrations, which means names could be removed in a less public process than a formal voter challenge. The strategy could mean electors won’t be summoned in advance to defend their voting rights and the identities of those seeking to purge voters might not be routinely public.
Groups like this are often using these group sourced lists of people that aren’t Republican, and are terribly inaccurate and full of flaws. These are the same people that were “finding” all the voter fraud they couldn’t prove, or show evidence of once those accusations had to be backed up by something in a courtroom.